CN102372065A

CN102372065A - Bicycle crank assembly

Info

Publication number: CN102372065A
Application number: CN2011101815716A
Authority: CN
Inventors: 野野下哲; 山中正广
Original assignee: Shimano Inc
Current assignee: Shimano Inc
Priority date: 2010-08-18
Filing date: 2011-06-30
Publication date: 2012-03-14
Anticipated expiration: 2031-06-30
Also published as: TW201208938A; CN102372065B; EP2532575B1; CN104058060A; TWI496717B; US8616085B2; US9359042B2; EP2532575A1; CN104058060B; EP2420436B1; US20120042746A1; EP2420436A1; US20140047947A1

Abstract

The present invention relates to a bicycle crank assembly provided with a crank arm that includes a first outer shell, a second outer shell, a first axle supporting member and a second axle supporting member. The first outer shell has a first elongated portion with a first axle attachment end. The second outer shell has a second elongated portion with a second axle attachment end. The first and second outer shells are adhesively attached together to form an interior cavity therebetween. The first axle supporting member is disposed at the first axle attachment end of the first outer shell. The first axle supporting member has a first bore with a first splined inner surface that is at least partially disposed in the interior cavity between the first and second outer shells. The second axle supporting member is disposed at the second axle attachment end of the second outer shell. The second axle supporting member has a second bore with a second splined inner surface that aligns with the first splined inner surface of the first bore and that is at least partially disposed in the interior cavity between the first and second outer shells.

Description

Crank component of bicycle

Technical field

Present invention relates in general to a kind of crank component of bicycle.More specifically, the present invention relates to a kind of composite bicycle crank assemblies.

Background technology

Bicycle crank arm is to be used for pedal is connected to crank shaft and is used for treadle effort is delivered to from pedal the parts of chain.The load that crank arm bears from pedal times without number although crank arm should have high strength also prevents to damage or distortion, and high hardness is so that prevent distortion or deflection when pedal is depressed.Crank arm preferably also is designed to light weight as far as possible, so that reduce the weight of whole bicycle.In the past, the common use of many preceding crank groups is the solid crank arm of forging metal member.These solid crank arms possibly be quite heavy according to the difference of material.These years recently, these solid crank arms with weight-saving metal alloy manufacturing more and/or be configured to hollow region and/or recess so that expendable weight (for example, referring to US patent No.6,058,803 with US patent No.6,145,184).In addition, recently, crank arm has been fabricated as has one or more parts of being processed by hard plastic material or fiber-reinforced resin material so that expendable weight (referring to US patent No.7,527,277).

Summary of the invention

One aspect of the present invention provides a kind of crank component of bicycle, and it is relative weight-saving, but has enough intensity.

According to another aspect of the present invention, a kind of crank component of bicycle is provided, it consists essentially of crank arm, and crank arm comprises first shell, second shell, primary shaft load-carrying element and the second axle bearing member.Said first shell has first elongate portion that has the primary shaft attachment end.Said second shell has second elongate portion that has second attachment end.Said first and second shells are attached at together between them, to form inner chamber bondingly.Said primary shaft load-carrying element is arranged on the primary shaft attachment end place of said first shell.Said primary shaft load-carrying element has first hole that has the first spline inside face, and is at least partially disposed in the inner chamber between first and second shells.The said second axle bearing member is arranged on second attachment end place of said second shell.The said second axle bearing member has second hole that has the second spline inside face that aligns with the first spline inside face in first hole, and is at least partially disposed in the inner chamber between first and second shells.

According to a further aspect of the invention, a kind of crank component of bicycle is provided, it consists essentially of crank arm, and crank arm comprises first shell, second shell and pedal attachment structure.Said first shell has the first pedal attachment end, the outshot that this first pedal attachment end has the first pedal shaft opening and gives prominence to along axial direction with respect to the said first pedal shaft opening.Said second shell has the second pedal attachment end, and this second pedal attachment end has the second pedal shaft opening of axially aligning with the said first pedal shaft opening.Said first and second shells are attached at together between them, to form inner chamber bondingly.Said pedal attachment structure is crossed over the inner chamber between the first and second pedal attachment end of said first and second shells.Said pedal attachment structure comprises the pedal axis hole of axially aligning with the said first and second pedal shaft openings.Said pedal attachment structure also comprises bearing surface; This bearing surface has the recess that is formed in this bearing surface; So that first shell of the contiguous said first pedal shaft opening of said bearing surface contact, and the said outshot of said first shell is arranged in the said recess of said pedal attachment structure.

Description of drawings

With reference now to this original disclosed part of formation, accompanying drawing:

Fig. 1 is the lateral plan that is equipped with according to the bicycle of a crank component of bicycle that embodiment is shown;

Fig. 2 illustrates the transverse sectional view of the crank component of bicycle of embodiment for basis;

Fig. 3 is the right crank arm of crank component of bicycle shown in Figure 2 and the outside exploded perspective view of crank shaft;

Fig. 4 is the right crank arm of Fig. 2 and crank component of bicycle shown in Figure 3 and the inside exploded perspective view of crank shaft;

Fig. 5 is the enlarged side view of Fig. 1 to Crank on chain wheel arm shown in Figure 4;

Fig. 6 arrives the cutaway view of Crank on chain wheel arm shown in Figure 5 for Fig. 1 when the hatching 6-6 along Fig. 5 observes;

Fig. 7 arrives the amplification view of the pedal attachment end of right crank arm shown in Figure 6 for Fig. 1 when the hatching 6-6 along Fig. 5 observes;

Fig. 8 arrives the amplification view of the crank shaft attachment end of right crank arm shown in Figure 6 for Fig. 1 when the hatching 6-6 along Fig. 5 observes;

Fig. 9 is for when the cutaway view of Fig. 1 when the section similar with the section of Crank on chain wheel arm shown in Figure 5 observed to the left crank arm of bicycle shown in Figure 4;

Figure 10 is the transverse sectional view according to the crank component of bicycle of embodiment another illustrate; And

Figure 11 is the transverse sectional view according to the bicycle crank arm of embodiment another illustrate.

The specific embodiment

Referring now to accompanying drawing selected embodiment is described.The description of embodiment below from the present invention, it will be apparent to one skilled in the art that only is an exemplary, rather than in order to limit the invention, the present invention is limited accompanying claims and equivalent thereof.

At first with reference to figure 1, bicycle 10 is depicted as the crank component of bicycle 12 that is equipped with according to first embodiment.Bicycle 10 has arch bar truck 14, and wherein front fork 16 is connected on this vehicle frame 14 pivotally.Crank assemblies 12 is installed to vehicle frame 14 with the usual manner of following explanation.Front-wheel 18 is installed to front fork 16, and trailing wheel 20 is installed to the rear end of vehicle frame 14.As shown in Figure 1, bicycle 10 is " racing cycle " (match type road cycling), and it has the arch bar truck 14 as the framework of bicycle.Yet crank component of bicycle 12 can use with the bicycle of other types.

With reference now to Fig. 2 and Fig. 3,, will discuss crank component of bicycle 12 in more detail now.Basically, crank assemblies 12 is supported on the intermediate axle housing 22 of vehicle frame 14.Intermediate axle housing 22 is formed on the point of crossing place of the seat pipe of vehicle frame 14, following pipe and Chain stay.Crank component of bicycle 12 consists essentially of right crank arm 30, left crank arm 32 and crank shaft 34.Crank shaft 34 rotatably supports to intermediate axle housing 22 by middle axle construction 36 in a usual manner.In the illustrated embodiment, crank component of bicycle 12 also comprises a pair of chain link 38 that is installed to right crank arm 30.As shown in Figure 1, pedal 40 is installed to

crank arm

30 and 32 each free ends, so the rider can make

crank arm

30 and 32 rotations come propelled bicycles 10 in a usual manner.

Crank arm

30 and 32 non-rotatably is installed to the opposite end of crank shaft 34.Like Fig. 2 to shown in Figure 4, the hollow tubular member that crank shaft 34 is preferably for example processed by chrome-molybdenum steel or other this high hardness alloys.As shown in Figure 2, the right-hand member of crank shaft 34 arrives right crank arm 30 through for example force fit and/or adhesive.In the illustrated embodiment, adhesives can be any suitable adhesive, for example the adhesives of epoxy type.Crank shaft 34 comprises a plurality of axially extended first spline 34a of first (right side) end that is arranged on crank shaft 34 and a plurality of axially extended second spline 34b that is arranged on second (left side) end of crank shaft 34.In this embodiment, the first spline 34a constructs and is arranged as from the outer peripheral face 34c of crank shaft 34 and extends radially outwardly, and the second spline 34b constructs and be arranged as radially outward outstanding with respect to the outer peripheral face 34c of crank shaft 34.The second spline 34b can be taper spline or non-taper spline.Crank shaft 34 is attached to the shaft supporting structure 60 of right crank arm 30 as following discussion.And as shown in Figure 4, crank shaft 34 has negative thread 34c.Negative thread 34c is formed in the inner peripheral surface of left end of crank shaft 34, with fastener shaft bolt 59 threadably, thereby left crank arm 32 is remained on the left end of crank shaft 34, and is as shown in Figure 2.

Middle axle construction 36 is many part assemblies, and it also comprises the pair of bearings 42 that is arranged in the bearing at end case that is screwed into intermediate axle housing 22 except other parts.Basically, middle axle construction 36 is installed in the intermediate axle housing 26 of vehicle frame 18 in a usual manner.And crank shaft 34 rotatably is supported in the intermediate axle housing 26 by the bearing 42 of middle axle construction 36 in a usual manner.Bearing 49 is ball bearing of main shaft or other antifriction-bearing boxs with inner ring and outer ring.

Middle axle construction 36 is installed on the intermediate axle housing 22, and crank shaft 34 rotatably is supported in the cylindrical intermediate axle housing 22 of main body of vehicle frame 12 through middle axle construction 36.Right crank arm 30 is fixed to the right-hand member of crank shaft 34 integratedly through being connected with easy fit that is installed to one of them terminal pedal 40 (Fig. 1) or force fit.Left side crank arm 32 is detachably fixed to the left end of crank shaft 34, and wherein another pedal 40 (Fig. 1) is installed to end.

To shown in Fig. 4 the best, in the embodiment shown in this, right crank arm 30 consists essentially of first shell 51 and second shell 52 like Fig. 2.First and

second shells

51 and 52 are fixedly secured together limiting inner chamber 54 at least in part, and inner chamber can be empty or be filled with light material (for example foam).In the embodiment shown in this, first and

second shells

51 and 52 are attached at together between them, to form inner chamber 54 bondingly.In the illustrated embodiment, adhesives can be any suitable adhesive.For example, can use the adhesives of epoxy type that first and

second shells

51 and 52 are fixed together.First shell 50 forms the outside face of crank arm 30, and second shell 52 forms the inside face of crank arm 30.

In the embodiment shown in this, to shown in Figure 4, right crank arm 30 also comprises pedal attachment structure 56 and shaft supporting structure 60 like Fig. 2.Pedal attachment structure 56 is constructed and arranged to one of them pedal 40 is fixed to the upper.In the inner chamber 54 of shaft supporting structure 60 between first and second shells 51 and 52.Shaft supporting structure 60 is constructed and arranged to crank shaft 34 is attached to right crank arm 30.Preferably, crank shaft 34 can be attached to crank arm 30 through adhesives.In the illustrated embodiment, adhesives can be any suitable adhesive, for example epoxy adhesive.In the embodiment shown in this, shaft supporting structure 60 comprises the primary shaft load-carrying element 61 and the second axle bearing member 62.Primary shaft load-carrying element 61 is attached to first shell 51.The second axle bearing member 62 is attached to second shell 52.

In the embodiment shown in this, to shown in Figure 4, right crank arm 30 also comprises sprocket wheel installation component 64 like Fig. 2.Sprocket wheel installation component 64 is constructed and arranged to chain link 38 is attached to right crank arm 30.In the embodiment shown in this, sprocket wheel installation component 64 is attached to first and

second shells

51 and 52 bondingly.In the illustrated embodiment, adhesives can be any suitable adhesive.For example can use the adhesives of epoxy type that the sprocket wheel installation component 64 and first and

second shells

51 and 52 are fixed together.

With reference now to Fig. 3, to Fig. 6, will discuss the structure of first shell 51 now in more detail.In the embodiment shown in this, first shell 51 is hard wares, and it forms through punching press or compacting single metal sheet.First shell 51 is made up of the appropriate rigidity material, and it for example is aluminum alloy or other the suitable materials with alumite coating, for example magnesium alloy, titanium alloy or other light metals.First shell 51 and second shell, 52 couplings are so that each of pedal attachment structure 56, shaft supporting structure 60 and sprocket wheel installation component 64 all is at least partially disposed in the inner chamber 54 between first and second shells 51 and 52.Substituting ground, first shell 51 is processed by the fiber-reinforced resin material, for example carbon fibre reiforced plastic or poly-mer (FRP).If first shell 51 is processed by the fiber-reinforced resin material; First shell 51 can be through with the prepreg of right quantity (for example so; Carbon cloth with resin dipping) cuts into the shape of expectation; And utilize metal to divide die sinking thermoforming prepreg then, make prepreg bend to Fig. 3 and shape shown in Figure 4 is made.

Shown in Fig. 3 and Fig. 4 the best, first shell 51 has first elongate portion 70, and this first elongate portion 70 has the first pedal attachment end 72 and primary shaft attachment end 74.The outshot 78 that the first pedal attachment end 72 has the first pedal shaft opening 76 and gives prominence to along axial direction with respect to the first pedal shaft opening 76.First elongate portion 70 has pair of

sidewalls

70a and 70b, and itself and second shell, 52 couplings are partly to limit inner chamber 54.The first pedal attachment end 72 has crooked sidewall 72a, and its

connection sidewall

70a and 70b are to form continuous sidewall.Primary shaft attachment end 74 has a plurality of

sidewall

74a, 74b, 74c and 74d.Sidewall 74a is constructed and arranged to and sprocket wheel installation component 64 coupling to 74d, with the upper end of the inner chamber 54 that surrounds receiving axes supporting construction 60.

When being shaped first shell 51, can the punching press unitary piece of metal in single punching press or pressing step, first shell 51 is configured as whole pressed metal sheet element.In other words, first elongate portion 70, the first pedal attachment end 72 and primary shaft attachment end 74 are shaped simultaneously, and outshot 78 is the curves that limit the first pedal shaft opening 76.

With reference now to Fig. 2, to Fig. 8, will discuss the structure of second shell 52 now in more detail.In the embodiment shown in this, second shell 52 is combined into single-piece with pedal attachment structure 56, for example single piece of forged metal.Yet, as required and/or expectation, can use metal stamping to handle second shell 52 and pedal attachment structure 56 are configured as single-piece.Second shell 52 is made up of the appropriate rigidity material, and it for example is aluminum alloy or other the suitable materials with alumite coating, for example magnesium alloy, titanium alloy or other light metals.

Shown in Fig. 3 and Fig. 4 the best, second shell 52 has second elongate portion 80, and this second elongate portion 80 has the second pedal attachment end 82 and second attachment end 84.The second pedal attachment end 82 has the second pedal shaft opening of axially aligning with the first pedal shaft opening 76 86.Second shell 52 is combined into single-piece with pedal attachment structure 56, for example single piece of forged metal.

Shown in Fig. 3 the best, second elongate portion 80 of second shell 52 has pair of sidewalls 80a and 80b.The second pedal attachment end 82 comprises pedal attachment structure 56.Pedal attachment structure 56

connection sidewall

80a and 80b are to form continuous sidewall.The sidewall 70a of

sidewall

80a and 80b and

first shell

51 and 70b coupling are partly to limit inner chamber 54.In the embodiment shown in this,

sidewall

80a and 80 is nested in the

sidewall

70a and 70b of first shell 51, and pedal attachment structure 56 is arranged on the crooked sidewall 72a inboard of the first pedal attachment end 72.At

sidewall

70a and 70b adhesives between

sidewall

80a and 80 first and

second shells

51 and 52 are attached at regularly.Second attachment end 84 of second shell 52 is the planar annular member with tab portion basically.Second attachment end 84 of the second axle bearing member 62 and second shell 52 forms.Therefore, in the embodiment shown in this, second shell 52, pedal attachment structure 56 and the second axle bearing member 62 are formed integrally as whole member.

Main reference Fig. 6 and Fig. 7 will discuss the structure of pedal attachment structure 56 now in more detail.The inner chamber 54 that pedal attachment structure 56 is crossed between the first and second

pedal attachment end

72 and 82 of first and second shells 51 and 52.Pedal attachment structure 56 comprises the pedal axis hole 56a that axially aligns with the first and second pedal shaft openings 76 and 86.The pedal shaft (not shown) of one of them pedal 40 is screwed among the pedal axis hole 56a.

Pedal attachment structure 56 also comprises bearing surface 56b, and this bearing surface 56b has the recess 56c that is formed among this bearing surface 56b.First shell 51 of the contiguous first pedal shaft opening 76 of bearing surface 56b contact, and the outshot 78 of first shell 51 is arranged among the recess 56c of pedal attachment structure 56.In the embodiment shown in this, the recess 56c of pedal attachment structure 56 comprises the continuous groove around pedal axis hole 56a, and the outshot 78 of first shell 51 comprises continuous flange.Yet substituting ground can provide the coupling of other types to arrange.For example, the outshot 78 of first shell 51 can be by the discontinuous flange processed of a plurality of single projection that is set to annular, and recess 56c can be a plurality of single recess of being arranged to annular around pedal axis hole 56a, so that single projection is mated with single recess.

With reference now to Fig. 3, Fig. 4 and Fig. 8,, will discuss the structure of shaft supporting structure 60 now in more detail.Shaft supporting structure 60 is made up of the appropriate rigidity material, for example aluminum alloy or other suitable materials.As described above, in the embodiment shown in this, shaft supporting structure 60 is made up of two discrete items (the for example first and second

axle bearing members

61 and 62).Primary shaft load-carrying element 61 is arranged on primary shaft attachment end 74 places of first shell 51.The second axle bearing member 62 is arranged on second attachment end 84 place of second shell 52.

In the embodiment shown in this, primary shaft load-carrying element 61 is attached to first shell 51 bondingly.Primary shaft load-carrying element 61 has the first hole 61a, and this first hole 61a has the first spline inside face.Primary shaft load-carrying element 61 is at least partially disposed in the inner chamber 54 between first and second shells 51 and 52.Primary shaft load-carrying element 61 has attached flange 61b, and this attached flange 61b is attached to the primary shaft attachment end 74 of first shell 51 bondingly.In the embodiment shown in this, primary shaft load-carrying element 61 is whole pressed metal sheet elements.In the embodiment shown in this, the second axle bearing member 62 and second shell 52 form whole.The second axle bearing member 62 has the second hole 62a, and this second hole 62a has the second spline inside face that aligns with the first spline inside face in first hole 61.The second axle bearing member 62 is at least partially disposed in the inner chamber 54 between first and second shells 51 and 52.The female splines easy fit of the first spline 34a of the first end of crank shaft 34 and the shaft supporting structure 60 of right crank arm 30 and through adhesive to said female splines.Particularly, first and second spline inside face 61a of the first spline 34a of the first end of crank shaft 34 and the first and second axle bearing

members

61 and 62 and 62a easy fit and through adhesive to said first and second spline inside face 61a and the 62a.In this case; Because the first spline 34a of the first end of crank shaft 34 has than first and second spline inside face 61a of the first and second axle bearing

members

61 and 62 and the smaller diameter of internal diameter of 62a, so can avoid the distortion of not expecting that when crank shaft 34 is inserted in the shaft supporting structure 60, can take place.Substituting ground, the first spline 34a of the first end of crank shaft 34 can with the first and second spline inside face 61a and the 62a force fit of the first and second axle bearing members 61 and 62.In this case, the first spline 34a of the first end of crank shaft 34 has than the first and second spline inside face 61a of the first and

second hole

61a and 62a and the bigger diameter of internal diameter of 62a, connects between them, to form force fit.

With reference now to Fig. 3, Fig. 4 and Fig. 6,, will discuss the structure of sprocket wheel installation component 64 now in more detail.In the embodiment shown in this, sprocket wheel installation component 64 is attached to first and

second shells

51 and 52 bondingly.In the embodiment shown in this, adhesives can be any suitable adhesive, for example epoxy adhesive.In the illustrated embodiment, sprocket wheel installation component 64 is processed by the fiber-reinforced resin material, for example carbon fibre reiforced plastic or poly-mer (FRP).Sprocket wheel installation component 64 can be through with the prepreg of right quantity (for example; Carbon cloth with resin dipping) cuts into the shape of expectation; And utilize metal to divide die sinking thermoforming prepreg then, so that prepreg bends to Fig. 3 and shape shown in Figure 4 is made.Substituting ground, sprocket wheel installation component 64 also can be processed by the proper metal material, for example aluminum alloy.

Sprocket wheel installation component 64 is as the spider arm of crank arm 30.Sprocket wheel installation component 64 is attached at least one of first and second shells 51 and 52.Crank shaft 34 passes the center port 64a of sprocket wheel installation component 64.The center port 64a of sprocket wheel installation component 64 is greater than the maximum gauge of crank shaft 34.In fact; Be fixed to through adhesives and/or force fit under the state of the second spline inside face of the second hole 62a in the tube that is formed on the second axle bearing member 62 at crank shaft 34, the tube of the second axle bearing member 62 passes the center port 64a of sprocket wheel installation component 64.Sprocket wheel installation component 64 has the recess 64b that extends to its periphery from the center port 64a of sprocket wheel installation component 64.The recess 64b of sprocket wheel installation component 64 receives second attachment end 84 of second shell 52.Therefore, the contact surface of the contact surface of the recess 64b of sprocket wheel installation component 64 and second attachment end 84 of second shell 52 provides big attachment interface, sprocket wheel installation component 64 is fixed to second shell 52 bondingly.

Like Fig. 3 and shown in Figure 4, sprocket wheel installation component 64 is members of starfish appearance basically, and it has five of radially extending with respect to center port 64a and radially extends arm 64c.End at arm 64c is formed with the attached hole of sprocket wheel with fastening chain link 38.The insertion of chain ring fastener is passed the attached hole of arm 64c to pass through the fastening chain link 38 of conventional approach.Each arm 64c also has lug 64d, and the sidewall 74a of itself and primary

shaft attachment end

74,74b, 74c and 74d coupling are to close at the space between first shell 51 and the sprocket wheel installation component 64.

With reference now to Fig. 9,, will discuss the structure of left crank arm 32 now in more detail.In the embodiment shown in this, left crank arm 32 consists essentially of first shell 91 and second shell 92.First and

second shells

91 and 92 are fixedly secured together limiting inner chamber 93 at least in part, and this inner chamber 93 can be empty or be filled with light material (for example foam).In the embodiment shown in this, first and

second shells

91 and 92 are attached at together between them, to form inner chamber 93 bondingly.In the illustrated embodiment, adhesives can be any suitable adhesive.For example, can use the adhesives of epoxy type that first and

second shells

91 and 92 are fixed together.Similar with right crank arm 30, left crank arm 32 also comprises pedal attachment structure 94 and shaft supporting structure 95.Pedal attachment structure 94 structures and layout are used for one of them pedal 40 is fixed to the upper.Shaft supporting structure 95 is arranged in the inner chamber 93 between first and second shells 91 and 92.Shaft supporting structure 95 structures and layout are attached to left crank arm 32 with crank shaft 34.Crank shaft 34 is attached to crank arm 30 releasedly through axle bolt shown in Figure 2 59.In the embodiment shown in this, shaft supporting structure 91 comprises the primary shaft load-carrying element 96 and the second axle bearing member 97.Primary shaft load-carrying element 96 is attached to first shell 91 bondingly.The second axle bearing member 97 is attached to second shell 92 bondingly.

In the embodiment shown in this, left crank arm 32 also comprises tension member 98.In the embodiment shown in this, tension member 98 is attached to first and

second shells

91 and 92 bondingly.In the illustrated embodiment, adhesives can be any suitable adhesive.

Left side crank arm 32 has and right crank arm 30 identical construction basically, except having removed the structure that is used for chain link is installed in first shell 91 and tension member 98, has still increased hole and the tension member 98 in first shell 91.Consider the similarity between

crank arm

30 and 32, will at length not discuss or set forth left crank arm 32 at this.

Forward Figure 10 now to, show crank component of bicycle according to embodiment another illustrate.Here, the right crank arm 130 of change is attached to the crank shaft 134 of change.The difference that only has between the right crank arm 30 of previous embodiment and the right crank arm 130 is the shell 151 that right crank arm 130 has change.Shell 151 only is shell 151 has been increased hole 151a with the difference of shell 51, so that crank shaft 134 can be from the insertion laterally of right crank arm 130.Crank shaft 134 is identical with crank shaft 34; Except the right-hand member 134a of crank shaft 134 is provided with butt flange 135; Be limited in trample during crank shaft 134 get into the motion among the hole 151a of right crank arm 130, and prevent further axially outwards motion on crank shaft 134 of crank arm 130 effectively.Consider the similarity between

crank arm

30 and 130, will at length not discuss or set forth crank arm 130 at this.

Second illustrate among the embodiment at this, the first spline 134a of the first end of crank shaft 134 loosely is installed to the shaft supporting structure 60 of right crank arm 130 along the radial direction of crank shaft 134.Particularly, the first spline 134a of the first end of crank shaft 134 loosely is installed to first and second spline inside face 61a and the 62a of the first and second axle bearing

members

61 and 62 along the radial direction of crank shaft 134.The first spline 134a of the first end of crank shaft 134 is attached to first and second hole 61a of the first and second axle bearing

members

61 and 62 and the first and second spline inside faces of 62a then bondingly.Therefore, the shaft supporting structure 60 of right crank arm 130 is attached to the first spline 134a of the first end of crank shaft 134 bondingly.In this case; Because the first spline 134a of the first end of crank shaft 134 has than first and second spline inside face 61a of the first and second axle bearing

members

61 and 62 and the smaller diameter of internal diameter of 62a, so can avoid the distortion of not expecting that when crank shaft 134 is inserted in the shaft supporting structure 60, can take place.Substituting ground, the first spline 134a of the first end of crank shaft 134 can with the first and second spline inside face 61a and the 62a force fit of the first and second axle bearing members 61 and 62.In this case, the first spline 134a of the first end of crank shaft 34 has than first and second spline inside face 61a of the first and second axle bearing

members

61 and 62 and the bigger diameter of internal diameter of 62a, connects between them, to form force fit.

Forward Figure 11 now to, show according to the right crank arm 230 of the change of embodiment another illustrate.Right crank arm 230 consists essentially of first shell 251 and second shell 252.In the embodiment shown in this, right crank arm 230 also comprises pedal attachment structure 256 and shaft supporting structure 260.Shaft supporting structure 260 comprises the primary shaft load-carrying element 261 and the second axle bearing member 262.In addition, right crank arm 230 also comprises sprocket wheel installation component 264.

The difference that only has between the right crank arm 30 of first embodiment and the right crank arm 230 is that the second axle bearing member 262 is attached to second shell 252 bondingly, rather than the integral part of second shell 252.Therefore, second shell 252 has changed to the second axle bearing member 262 that holds as individual component with sprocket wheel installation component 264.Consider the similarity between

crank arm

30 and 230, will at length not discuss or set forth right crank arm 230 at this.Though primary shaft load-carrying element 261 is and the independent member of second shaft supporting structure 262 in the embodiment shown in this; But as long as the first and second

axle bearing members

261 and 262 are attached to first and second shells 251 respectively and 252, the first and second

axle bearing members

261 and 262 also can be integrated members.

When understanding scope of the present invention; As in this use; Term " comprises " and derivative is intended for open-ended term; It clearly limits the existence of said characteristic, element, parts, group, integral body and/or step, but does not get rid of the existence that other do not state characteristic, element, parts, group, integral body and/or step.Above-mentioned explanation also is applicable to the speech with similar meaning, and for example term " comprises ", " having " and their derivative.And term " part ", " part ", " portion ", " member " or " element " can have the dual meaning of single part or a plurality of parts when as odd number.As in this use; Term " by attached " or " attached " comprise through element directly is attached to another element with this element directly be fixed to the structure of another element, through element being attached to intermediate member and then this intermediate member being attached on another element and being the structure of one with structure and an element and another element that this element is fixed to another element indirectly, i.e. structure that element is the part of another element in essence.This definition also is applicable to the speech with similar meaning, for example term " joint " and " fixing " and their derivative.At last, at the degree term of this use, for example " basically ", " approximately ", " being similar to " mean the reasonable bias of being modified term, make net result not by remarkable change.

Though only selected selected embodiment to come illustration the present invention, those skilled in the art will be clear from the present invention, under the situation that does not break away from the scope of the invention of liking the claim qualification enclosed, can make various changes and change.For example, the size of each parts, shape, position or orientation can as required and/or be expected to change.The parts that are depicted as mutual direct connection or contact can have the intermediate structure that is arranged between them, only if explicitly call for direct contact.Therefore, aforementioned according to an embodiment of the invention description only is used for illustration rather than in order to limit the present invention, the present invention is limited said claim and equivalent thereof.

Claims

1. crank component of bicycle comprises:

Crank arm, it comprises:

First shell, it has first elongate portion that has the primary shaft attachment end,

Second shell, it has second elongate portion that has second attachment end, and said first shell and said second shell are attached at together between them, forming inner chamber bondingly,

The primary shaft load-carrying element; It is arranged on the said primary shaft attachment end place of said first shell; Said primary shaft load-carrying element has first hole that has the first spline inside face, and is at least partially disposed in the said inner chamber between said first shell and said second shell

The second axle bearing member; It is arranged on said second attachment end place of said second shell; The said second axle bearing member has second hole that has the second spline inside face that aligns with the said first spline inside face in said first hole, and is at least partially disposed in the said inner chamber between said first shell and said second shell.

2. crank component of bicycle according to claim 1, wherein

Said primary shaft load-carrying element is attached to said first shell, and the said second axle bearing member is attached to said second shell.

3. crank component of bicycle according to claim 2, wherein

Said primary shaft load-carrying element is attached to said first shell bondingly.

4. crank component of bicycle according to claim 2, wherein

The said second axle bearing member is attached to said second shell bondingly.

5. crank component of bicycle according to claim 2, wherein

Said second axle bearing member and said second shell form whole.

6. crank component of bicycle according to claim 1, wherein

Said crank arm also comprises at least one the sprocket wheel installation component that is attached to said first shell and said second shell bondingly.

7. crank component of bicycle according to claim 6, wherein

Said sprocket wheel installation component is processed by the fiber-reinforced resin material.

8. crank component of bicycle according to claim 1 also comprises

Axle, it comprises a plurality of first splines at the first end place that is arranged on said axle and a plurality of second splines that are arranged on the second end place of said axle.

9. crank component of bicycle according to claim 8, wherein

Said first spline of the said first end of said axle and the said first spline inside face and the said second spline inside face force fit of said primary shaft load-carrying element and the said second axle bearing member.

10. crank component of bicycle according to claim 8, wherein

Said first spline of the said first end of said axle loosely is installed to the said first spline inside face and the said second spline inside face of said primary shaft load-carrying element and the said second axle bearing member along the radial direction of said axle, and

Said first spline of the said first end of said axle is attached to the said first spline inside face and the said second spline inside face of said primary shaft load-carrying element and the said second axle bearing member bondingly.

11. crank component of bicycle according to claim 8, wherein

The said first spline inside face of the said primary shaft load-carrying element of said crank arm and the said second axle bearing member and the said second spline inside face are attached to said first spline of the said first end of said axle bondingly.

12. a crank component of bicycle comprises:

Crank arm, it comprises:

First shell, it has the first pedal attachment end, the outshot that the said first pedal attachment end has the first pedal shaft opening and gives prominence to along axial direction with respect to the said first pedal shaft opening,

Second shell; It has the second pedal attachment end; The said second pedal attachment end has the second pedal shaft opening of axially aligning with the said first pedal shaft opening, and said first shell and said second shell are attached at together between them, to form inner chamber bondingly

The pedal attachment structure; It is crossed at the said first pedal attachment end of said first shell and said second shell and the inner chamber between the said second pedal attachment end; Said pedal attachment structure comprises the pedal axis hole of axially aligning with said first pedal shaft opening and the said second pedal shaft opening; Said pedal attachment structure also comprises bearing surface; Said bearing surface has the recess that is formed in this bearing surface, so that said first shell of the contiguous said first pedal shaft opening of said bearing surface contact, and the said outshot of said first shell is arranged in the said recess of said pedal attachment structure.

13. crank component of bicycle according to claim 12, wherein

The said recess of said pedal attachment structure comprises the continuous groove around said pedal axis hole, and

The said outshot of said first shell comprises continuous flange.

14. crank component of bicycle according to claim 12, wherein

Said first shell is a whole pressed metal sheet element, and wherein said outshot is the curve that limits the said first pedal shaft opening.

15. crank component of bicycle according to claim 14, wherein

Said second shell and said pedal attachment structure are combined into the single-piece of forging metal.

16. crank component of bicycle according to claim 12, wherein

Said crank arm also comprises the shaft supporting structure in the said inner chamber that is arranged between said first shell and said second shell.

17. crank component of bicycle according to claim 16, wherein

The second axle bearing member that said shaft supporting structure comprises the primary shaft load-carrying element that is attached to said first shell and is attached to said second shell.

18. crank component of bicycle according to claim 18, wherein

Said primary shaft load-carrying element is a whole pressed metal sheet element, and

The said second axle bearing member, said second shell and said pedal attachment structure are combined into the single-piece of forging metal.

19. crank component of bicycle according to claim 12, wherein

Said crank arm also comprises the sprocket wheel installation component that is attached to said first shell and said second shell bondingly.

20. crank component of bicycle according to claim 19, wherein

21. crank component of bicycle according to claim 16 also comprises

Be attached to the axle of the said shaft supporting structure of said crank arm, said axle comprises a plurality of first splines at the first end place that is arranged on said axle and a plurality of second splines that are arranged on the second end place of said axle.

22. crank component of bicycle according to claim 21, wherein

Said first spline of the said first end of said axle and the said shaft supporting structure force fit of said crank arm.

23. crank component of bicycle according to claim 21, wherein

Said first spline of the said first end of said axle loosely is installed to the said shaft supporting structure of said crank arm along the radial direction of said axle.

24. crank component of bicycle according to claim 21, wherein

The said shaft supporting structure of said crank arm is attached to said first spline of the said first end of said axle bondingly.